Rockwell Automation 1756-DMF30 ControlLogix Drive Module - Manual (Page 358)

Publication 1756-UM522B-EN-P - February 2003
C-106 1756-DMF30 Specific Information
Parameter 2122 [MC Faults]
This parameter indicates the occurance of a motor-control fault.
These bits are set when a fault event is detected. They stay latched
until bit 19 [Clear Fault] of parameter 152 [Applied Logic Cmd] or bit
19 [Clr Drv Wrn] of parameter 166 [Motor Ctrl Cmd] is set. If the fault
event remains present, the identifying bit is set again.
Bit Fault Name Fault Description
0 SCR Fault An SCR has shorted. Check Parameter 2124 [Pwr
DeviceStatus] to determine which SCR has shorted.
3 AC Line Sync AC line voltage has been missing for more than 2
seconds. Refer to parameter 2123 bit 3
[LineSyncLoss].
4 InstOvr Curr Armature current feedback has exceeded 175% of the
value in parameter 2184 [PMI Curr Lim].
6 Field Loss A field loss has been detected:
•••• Parameter 2132 [Fld Amps Fdbk] has been less
than parameter 2187 [FldLos Trip Pt] for more
than 5 times the electrical time constant of the
field. This assumes parameter 152 [Applied
LogicCmd] bit 30 [Field En] is on.
•••• Parameter 2132 [Fld Amps Fdbk] has been less
than parameter 2187 [FldLos Trip Pt] for more
than 30mS after the field has been turned on. -
•••• Parameter 2132 [Fld Amps Fdbk] has been
greater than 150% of parameter 2185 [Hot Fld
Cur] for more than 30mS.
•••• Parameter 2132 [Fld Amps Fdbk] has been
greater than parameter 2207 [Fld PMI Rating]
for more than 30mS.
8 TachWire Opn A sine or cosine signal being used for speed or other
application feedback is missing, due to one of the
following causes:
•••• a resolver wiring connection has broken
•••• The value in parameter 2161 [Resolver Gain] is
too low.
The Drive Module always performs this test if
resolver feedback is selected (parameter 222 [Motor
Fdbk Sel] equals “0 - Resolver”), and when parameter
168 [Drive I/O Ctrl] bit 10 [Dis Brkn Wire] equals one.
9 ResolverCard A fuse on the Resolver & Drive l/O module has blown.
11 PwrTech Card The watchdog timer on the D-C Power Technology
module has expired. This fault disables the gate firing
circuitry.